Test and generalize font configuration parser

Add a basic unit test for the Android font configuration parser.
Add a check for the new LMP file format; on detection, switch to a new
(as-yet unwritten) parser.

R=bungeman@google.com, djsollen@google.com, tomhudson@google.com

Author: tomhudson@chromium.org

Review URL: https://codereview.chromium.org/439813002

2 files changed, 351 insertions, 0 deletions

diff --git a/resources/android_fonts/v17/fallback_fonts.xml b/resources/android_fonts/v17/fallback_fonts.xml
new file mode 100644
index 0000000000..ede7ef47d2
--- /dev/null
+++ b/resources/android_fonts/v17/fallback_fonts.xml
@@ -0,0 +1,213 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Fallback Fonts
+
+    This file specifies the fonts, and the priority order, that will be searched for any
+    glyphs not handled by the default fonts specified in /system/etc/system_fonts.xml.
+    Each entry consists of a family tag and a list of files (file names) which support that
+    family. The fonts for each family are listed in the order of the styles that they
+    handle (the order is: regular, bold, italic, and bold-italic). The order in which the
+    families are listed in this file represents the order in which these fallback fonts
+    will be searched for glyphs that are not supported by the default system fonts (which are
+    found in /system/etc/system_fonts.xml).
+
+    Note that there is not nameset for fallback fonts, unlike the fonts specified in
+    system_fonts.xml. The ability to support specific names in fallback fonts may be supported
+    in the future. For now, the lack of files entries here is an indicator to the system that
+    these are fallback fonts, instead of default named system fonts.
+
+    There is another optional file in /vendor/etc/fallback_fonts.xml. That file can be used to
+    provide references to other font families that should be used in addition to the default
+    fallback fonts. That file can also specify the order in which the fallback fonts should be
+    searched, to ensure that a vendor-provided font will be used before another fallback font
+    which happens to handle the same glyph.
+
+    Han languages (Chinese, Japanese, and Korean) share a common range of unicode characters;
+    their ordering in the fallback or vendor files gives priority to the first in the list.
+    Language-specific ordering can be configured by adding a BCP 47-style "lang" attribute to
+    a "file" element; fonts matching the language of text being drawn will be prioritised over
+    all others.
+-->
+<familyset>
+    <family>
+        <fileset>
+            <file variant="elegant">DroidNaskh-Regular.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="compact">DroidNaskhUI-Regular.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansEthiopic-Regular.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansHebrew-Regular.ttf</file>
+            <file>DroidSansHebrew-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="elegant">NotoSansThai-Regular.ttf</file>
+            <file variant="elegant">NotoSansThai-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="compact">NotoSansThaiUI-Regular.ttf</file>
+            <file variant="compact">NotoSansThaiUI-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansArmenian.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansGeorgian.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="elegant">NotoSansDevanagari-Regular.ttf</file>
+            <file variant="elegant">NotoSansDevanagari-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="compact">NotoSansDevanagariUI-Regular.ttf</file>
+            <file variant="compact">NotoSansDevanagariUI-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="elegant">NotoSansTamil-Regular.ttf</file>
+            <file variant="elegant">NotoSansTamil-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="compact">NotoSansTamilUI-Regular.ttf</file>
+            <file variant="compact">NotoSansTamilUI-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="elegant">NotoSansMalayalam-Regular.ttf</file>
+            <file variant="elegant">NotoSansMalayalam-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="compact">NotoSansMalayalamUI-Regular.ttf</file>
+            <file variant="compact">NotoSansMalayalamUI-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="elegant">NotoSansBengali-Regular.ttf</file>
+            <file variant="elegant">NotoSansBengali-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="compact">NotoSansBengaliUI-Regular.ttf</file>
+            <file variant="compact">NotoSansBengaliUI-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="elegant">NotoSansTelugu-Regular.ttf</file>
+            <file variant="elegant">NotoSansTelugu-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="compact">NotoSansTeluguUI-Regular.ttf</file>
+            <file variant="compact">NotoSansTeluguUI-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="elegant">NotoSansKannada-Regular.ttf</file>
+            <file variant="elegant">NotoSansKannada-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="compact">NotoSansKannadaUI-Regular.ttf</file>
+            <file variant="compact">NotoSansKannadaUI-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="elegant">NotoSansKhmer-Regular.ttf</file>
+            <file variant="elegant">NotoSansKhmer-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="compact">NotoSansKhmerUI-Regular.ttf</file>
+            <file variant="compact">NotoSansKhmerUI-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="elegant">NotoSansLao-Regular.ttf</file>
+            <file variant="elegant">NotoSansLao-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file variant="compact">NotoSansLaoUI-Regular.ttf</file>
+            <file variant="compact">NotoSansLaoUI-Bold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>NanumGothic.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>Padauk-book.ttf</file>
+            <file>Padauk-bookbold.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>NotoSansSymbols-Regular.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>AndroidEmoji.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>NotoColorEmoji.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file>DroidSansFallback.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <fileset>
+            <file lang="ja">MTLmr3m.ttf</file>
+        </fileset>
+    </family>
+    <!-- Note: complex scripts (i.e. those requiring shaping in Harfbuzz) have
+         a cumulative limit of 64k glyphs. Thus, if they are placed after the
+         large fonts such as DroidSansFallback, they are likely to render
+         incorrectly. Please use caution when putting fonts toward the end of
+         the list.
+    -->
+</familyset>
diff --git a/resources/android_fonts/v17/system_fonts.xml b/resources/android_fonts/v17/system_fonts.xml
new file mode 100644
index 0000000000..549f061b0c
--- /dev/null
+++ b/resources/android_fonts/v17/system_fonts.xml
@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    System Fonts
+
+    This file lists the font families that will be used by default for all supported glyphs.
+    Each entry consists of a family, various names that are supported by that family, and
+    up to four font files. The font files are listed in the order of the styles which they
+    support: regular, bold, italic and bold-italic. If less than four styles are listed, then
+    the styles with no associated font file will be supported by the other font files listed.
+
+    The first family is also the default font, which handles font request that have not specified
+    specific font names.
+
+    Any glyph that is not handled by the system fonts will cause a search of the fallback fonts.
+    The default fallback fonts are specified in the file /system/etc/fallback_fonts.xml, and there
+    is an optional file which may be supplied by vendors to specify other fallback fonts to use
+    in /vendor/etc/fallback_fonts.xml.
+-->
+<familyset>
+
+    <family>
+        <nameset>
+            <name>sans-serif</name>
+            <name>arial</name>
+            <name>helvetica</name>
+            <name>tahoma</name>
+            <name>verdana</name>
+        </nameset>
+        <fileset>
+            <file>Roboto-Regular.ttf</file>
+            <file>Roboto-Bold.ttf</file>
+            <file>Roboto-Italic.ttf</file>
+            <file>Roboto-BoldItalic.ttf</file>
+        </fileset>
+    </family>
+
+    <family>
+        <nameset>
+            <name>sans-serif-light</name>
+        </nameset>
+        <fileset>
+            <file>Roboto-Light.ttf</file>
+            <file>Roboto-LightItalic.ttf</file>
+        </fileset>
+    </family>
+
+    <family>
+        <nameset>
+            <name>sans-serif-thin</name>
+        </nameset>
+        <fileset>
+            <file>Roboto-Thin.ttf</file>
+            <file>Roboto-ThinItalic.ttf</file>
+        </fileset>
+    </family>
+
+    <family>
+        <nameset>
+            <name>sans-serif-condensed</name>
+        </nameset>
+        <fileset>
+            <file>RobotoCondensed-Regular.ttf</file>
+            <file>RobotoCondensed-Bold.ttf</file>
+            <file>RobotoCondensed-Italic.ttf</file>
+            <file>RobotoCondensed-BoldItalic.ttf</file>
+        </fileset>
+    </family>
+    <family>
+        <nameset>
+            <name>serif</name>
+            <name>times</name>
+            <name>times new roman</name>
+            <name>palatino</name>
+            <name>georgia</name>
+            <name>baskerville</name>
+            <name>goudy</name>
+            <name>fantasy</name>
+            <name>ITC Stone Serif</name>
+        </nameset>
+        <fileset>
+            <file>DroidSerif-Regular.ttf</file>
+            <file>DroidSerif-Bold.ttf</file>
+            <file>DroidSerif-Italic.ttf</file>
+            <file>DroidSerif-BoldItalic.ttf</file>
+        </fileset>
+    </family>
+
+    <family>
+        <nameset>
+            <name>Droid Sans</name>
+        </nameset>
+        <fileset>
+            <file>DroidSans.ttf</file>
+            <file>DroidSans-Bold.ttf</file>
+        </fileset>
+    </family>
+
+    <family>
+        <nameset>
+            <name>monospace</name>
+            <name>courier</name>
+            <name>courier new</name>
+            <name>monaco</name>
+        </nameset>
+        <fileset>
+            <file>DroidSansMono.ttf</file>
+        </fileset>
+    </family>
+
+    <family>
+        <nameset>
+            <name>casual</name>
+        </nameset>
+        <fileset>
+            <file>ComingSoon.ttf</file>
+        </fileset>
+    </family>
+
+    <family>
+        <nameset>
+            <name>cursive</name>
+        </nameset>
+        <fileset>
+            <file>DancingScript-Regular.ttf</file>
+            <file>DancingScript-Bold.ttf</file>
+        </fileset>
+    </family>
+
+    <family>
+        <nameset>
+            <name>sans-serif-smallcaps</name>
+        </nameset>
+        <fileset>
+            <file>CarroisGothicSC-Regular.ttf</file>
+        </fileset>
+    </family>
+
+</familyset>